SHAREHOLDERS' EQUITY - Changes in Accumulated Other Comprehensive Income (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Accumulated Other Comprehensive Income [Roll Forward]
Balance, beginning of period	$ 8,934	$ 6,615	$ 2,151
Other comprehensive income loss before reclassifications net of tax	(1,550)	1,322	4,466
Amounts reclassified from accumulated other comprehensive income (loss) net of tax	9	149	(2)
Other comprehensive income (loss), net of tax	(1,541)	1,471	4,464
Balance, end of period	7,393	8,934	6,615
Accounting Standards Update 2019-04 | Cumulative effect, period of adoption, adjustment
Accumulated Other Comprehensive Income [Roll Forward]
Balance, beginning of period		848
Balance, end of period			848
Accounting Standards Update 2019-04 | Cumulative effect, period of adoption, adjusted balance
Accumulated Other Comprehensive Income [Roll Forward]
Balance, beginning of period		7,463
Balance, end of period			7,463
Unrealized foreign currency translation gains (losses)
Accumulated Other Comprehensive Income [Roll Forward]
Balance, beginning of period	(1,109)	(1,623)	(1,847)
Other comprehensive income loss before reclassifications net of tax	(904)	514	224
Amounts reclassified from accumulated other comprehensive income (loss) net of tax	0	0	0
Other comprehensive income (loss), net of tax	(904)	514	224
Balance, end of period	(2,013)	(1,109)	(1,623)
Unrealized foreign currency translation gains (losses) | Accounting Standards Update 2019-04 | Cumulative effect, period of adoption, adjustment
Accumulated Other Comprehensive Income [Roll Forward]
Balance, beginning of period		0
Balance, end of period			0
Unrealized foreign currency translation gains (losses) | Accounting Standards Update 2019-04 | Cumulative effect, period of adoption, adjusted balance
Accumulated Other Comprehensive Income [Roll Forward]
Balance, beginning of period		(1,623)
Balance, end of period			(1,623)
Unrealized gains (losses) on fixed maturity securities
Accumulated Other Comprehensive Income [Roll Forward]
Balance, beginning of period	10,361	8,548	4,234
Other comprehensive income loss before reclassifications net of tax	(735)	839	4,327
Amounts reclassified from accumulated other comprehensive income (loss) net of tax	(24)	126	(13)
Other comprehensive income (loss), net of tax	(759)	965	4,314
Balance, end of period	9,602	10,361	8,548
Unrealized gains (losses) on fixed maturity securities | Accounting Standards Update 2019-04 | Cumulative effect, period of adoption, adjustment
Accumulated Other Comprehensive Income [Roll Forward]
Balance, beginning of period		848
Balance, end of period			848
Unrealized gains (losses) on fixed maturity securities | Accounting Standards Update 2019-04 | Cumulative effect, period of adoption, adjusted balance
Accumulated Other Comprehensive Income [Roll Forward]
Balance, beginning of period		9,396
Balance, end of period			9,396
Unrealized gains (losses) on derivatives
Accumulated Other Comprehensive Income [Roll Forward]
Balance, beginning of period	(34)	(33)	(24)
Other comprehensive income loss before reclassifications net of tax	(1)	(1)	(9)
Amounts reclassified from accumulated other comprehensive income (loss) net of tax	5	0	0
Other comprehensive income (loss), net of tax	4	(1)	(9)
Balance, end of period	(30)	(34)	(33)
Unrealized gains (losses) on derivatives | Accounting Standards Update 2019-04 | Cumulative effect, period of adoption, adjustment
Accumulated Other Comprehensive Income [Roll Forward]
Balance, beginning of period		0
Balance, end of period			0
Unrealized gains (losses) on derivatives | Accounting Standards Update 2019-04 | Cumulative effect, period of adoption, adjusted balance
Accumulated Other Comprehensive Income [Roll Forward]
Balance, beginning of period		(33)
Balance, end of period			(33)
Pension liability adjustment
Accumulated Other Comprehensive Income [Roll Forward]
Balance, beginning of period	(284)	(277)	(212)
Other comprehensive income loss before reclassifications net of tax	90	(30)	(76)
Amounts reclassified from accumulated other comprehensive income (loss) net of tax	28	23	11
Other comprehensive income (loss), net of tax	118	(7)	(65)
Balance, end of period	$ (166)	(284)	(277)
Pension liability adjustment | Accounting Standards Update 2019-04 | Cumulative effect, period of adoption, adjustment
Accumulated Other Comprehensive Income [Roll Forward]
Balance, beginning of period		0
Balance, end of period			0
Pension liability adjustment | Accounting Standards Update 2019-04 | Cumulative effect, period of adoption, adjusted balance
Accumulated Other Comprehensive Income [Roll Forward]
Balance, beginning of period		$ (277)
Balance, end of period			$ (277)